How many factions are there?

So, you can come up with 4 more races? And without ruining the balance? By the way, think about how 4 neutral races will affect the game's plot. Where will you fit them in if the battle is specifically between good and evil, and there were no neutrals to begin with? So, you can fit them in somewhere, but it will be quite difficult. And since there were no neutral castles in Heroes 5, let's not have them. (Hacker convinced me)